Die structure for metallic cartridge belt links



AU8 15, 1944- K. H. FERNLUND :TAL 2,355,964

' DIE STRUCTURE FOR` METALLIC CARTRIDGE BELT LINKS y Filed June 5, 1942 7 Smeets-sheet 1 .'lllmm W lllllmm:

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DIE STRUCTURE FOR METALLIC CARTRIDGE BELT LINKS Filed June 5, 1942 7 Sheets-Sheet 2 y j; V 5 fwm Aug 15, 1944-4 K. H. FERNLUND ETAL l 2,355,964

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' DIE STRUCTURE FOR METALLIC CARTRIDGE BELT LINKS Filed Jung 5. i942 7 sheets-sheet 5 f4 VE] /fffO/I/ess 1' ....fwwfzf/Y fiery b ,L l

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K. H. FERNLUND ETAL 2,355,964 DIE STRUCTURE FOR METALLIC CARTRIDGE BELT LINKS Fired .I ne 5, 1942 '7 Sheets-Sheef 6 Aug. 15, 1944.`

K. H. FERNLuNp E1" AL DIE STRUCTURE FOR METALLIC CARTRIDGE BELT LINKS .Filed June 5. y1942 v sheets-sheet '7 member;

Patented Aug. 15, 1944 laai'rifilvr` yorner.

" DIE! STRUCTURE ron METALLIC CARTRIDGE BELT LINKS l Karl H. Fem1na,-.ohn onessleigana Allan-E.

Hultberg, Chicago, Ill., assignors, by mesne asvvsignmenrtvs, .to' the `United StatesGovernment,- l

sented by .the Secretary Iuf` War and his Application-Julie 5, 1942.1` serial No. A145,.996 Solaires. 01; 59,-6) Y This invention relates to the' manufacture' of metallic cartridge belt `linksgand Vmorefparticularly to improved die structure for progressively and eciently forming the links.'A

An important objectvof theinventionfis to' pro.- 5

vide a Vcompact unitaryand selfLconjtained forming and die structure in whichpun'ching' "and forming members are allassembledyone ofwfthe unit elements, and .cooperablediLandl'forming members'are vall mounted on the otherelementv so 10 that, in order to operate this unitary structure it need only be mounted .with one of fits elements resting on the bed plate of, anfordinary` punch press with the other element subjected to the Vreciprocating movement of the punch press head.

A further object is` to provide a number .of

`forming fields inthe unitarystructure through rwhich the metal stock band is progressively fed for progressive .preliminary forming. of` the links .A in comparatively iiat form, and then in the final forming iield `bending the link :loop forming tongues orr arms intocirculargform around forming arbors. f v l Y Another importantobject is to mount the iarbor structure on a resilient support for engagement of the embryo links between the arbors andthe `movable die structureelementffor preliminary bendingof the:` link tongues toward circular form against the resistanceof the resilient support, @3i-0 and then final-forming into circular form ,of the tongues against a stationary die or'.l forming member. r" f The various features of the invention` are 1in- "corporated infthe structureshownon the drawfings, in which drawings: l v u rFigure 1 is an end elevation ofthe'unitarydie Structure; l u .u lFigure 2 is a'sectiononplaneII-lf Figure Gris a view similar'toFigure l-showing the .Upper die member in its finalpositionv rela; tiverto the lower die member; u

' Figure 7 is an enlargedview `-of'Figure 2;

Figure s is an enlarged section vlIII-vmvof Figurez; .s

IX-f-IXof Figure 2, showing 'the ejector mech,- anism about to operate; Y nl n Figurey l0' is alsc'tion similar to Figure -9 showing the operation ofthe ejector mechanism* Figure v11 is,A a plan view of the stock bandlwith the Hnfibryo link formations preparatory to final Figure 12 is `a side viewof the lstructure in Figurll; u uu, I" I: y

Figure ,13 isa side view of theembryo link severed from the band-and to be subjected to the arborstructure `forprogressive formingpi the link tongues into the circular loops;

' Figurelfi shows the-loops partially formed; y Figure 15 is an uend view `oiythe inishedI link; and, r p

`Figure 16 is aplan view of the `iinished link..l The link'to be manufactured by the die struc'- Yture disclosed is shown in Figures l5 and 15. The link Acomprises'the transversely extending body partl 0, from one edgeol` which at the ends theregf extendxthe, circular loops Il `and l2` for supporting a cartridge, and from'whose lother edge 'at the middle thereof .extends the. citclilai vhinge loep ltwhih 1001 intheV assembly'of a belt, engages between the .loops H `and |201?l an adjacent link to receive the'body of the cartridge,` the cartridges `thusv forming hinge pins vfor the assembled belt1 In order to get the proper center 'distance between theaxis of the loop` |.3 and the axis Q f the loops Il and,l2 the ends Hluolf the bodyare Qffseta distance from the central portion thereof from which the loop. L3l extends:I

Referring to Figures 1 and 2, theunitary .die structure comprises the die shoe or baseblock Mend the punch holding block I 5. The structure ,lisf mounted ,in an. ordinary punch press 'with its dieshoe resting` on thepress bed ,l 6. and With the punch holder block` :inthepath ofthe -reciprocated head or .rarnv (not shown) of ythe press. ,''elscoping guide postsjl andl i8 extend from theldie shoe Vzandpurich blockJ respectively, and are surrounded by springv 1 9.J for holding 'the `pu'ncli block .tothepunchhead or ram so that, as

'the lfram ispvevrtically reciprocated,v the punch block will becorrespondingly moved toward and 'awfy .from the dierblock for cooperation of the yariou's forming andV die elements mounted on the blocks. I u The metal stock band 20 `from whichthe links areto be formed vis progressivelyfedv through rthe die ,structure in arhorizovntal plane, the band, duringits passage through thedie structure .being ysubjected infivejdie `fields for 've progressive VFigure 9 is 'an enlarged section ori 4plane K5 stages of formation. These ve-elds are'indicated as A, B, C, D and E. Referring to Figure 11, the links take up the full Width of the stock band 20, and in the iield A the stock is cut to outline the tongue I3 which eventually is bent into circular shape to form the hinge loop of the finished link. "I he tongue -I3 is notffu'lly cut out'o'f the blank, but uncut positions `2I are left at opposite sides of the tongue to serve as ties for holding the embryo links together as the band pro-lf gresses through the die structure... .Referring to., o Figures 2 and 3, this rst cutting of the blankis' performed by the punch member 22 on the punch block I and the die memberf23`on'the block In the second forming fieldv VB, the-' punched to leave the space '24between the body' portion I0 of the link and the end of the tongue I3 of the preceding embryo link', and at the same i time the Vband is cut out to leave the spaces 25z (Figure 11) between the ends of the loop form-I ing tongues IIand I2.of the one link andthe body I0 of the preceding embryolink7 This punching-operation-is performed the .punch member. 26 on thepunch block .I5A1and the vdie-as sembly 21 on the die block I 4. n l Y. .A

In the forming field C, the endof Vthe hinge loop forming tongue I3 and the endsof the', cartridge vsupporting loop formingtongues IIfand I2 jare the punch member 3 I -onv the punch block'and'the die member 32 on the die .block (Figures 2 3 and 4). The deflection. 30 is such thatthe link body and the inner en ds-of the" tongues II` and IZ-will be bent substantially 9 0 toform the first quarter ofthe respective link loops. .The link is now ready for its final Aformation'in the eld E in which the middle portions of the tongues arebent to complete the circular. link loops, .and in! this field, the embryo. link, before the nal bending, is severed from the succeeding link by cutting of lthe band along the tie lines 2 I, The severed embryo link is shown on Figure 13 `and in v'dotted lines Figure 11.

The forming structurein thefiie'ld E comprises o the punch member 33 having in its front'vsidethe recesses 34 and'35 between v.which extends the formingwall 36 which functions the .fin-al forming vof thelt'ongue 'I3 oftheembryof link. In its bottomthe punch 33 has the semi-circular forming recess 31 half 'of which fis in thewall.- 3.6. When the punchmember. 33. moves down. with the punch block the lrecesses 34 and35willreceive the endsY vofY the tongues II and I2 ofthe embryo link which follows the link which has and isfentered theield E. The bottom'of-the punch member 33, back of the'recesses 34 4and 35,'vis cut away to leave the arcuate spaces 38 and 39 for receiving the offset ends I0' of the link Vbody I0.

Referring to Figures 1, 2, 5-and 6, the punch member 33 has in ,its rear, side the vertically extending rectangular channel 40 which is. opposite the Yforming wall36, the Walls 4I and 42 adthe recesses or channels 34 and 35 in the front side of the punch member. As shown on Figures 2, 5, 6 and 8, the punch member 33 has in its lower end the arcuate channel 43 which, in alignment with the lower ends of the walls 4I and 42,"is of increased 'Jdi'ame'ter to provide the arcuate forming surfaces 44 and 45 for the ends of the tongues II and I2 of the embryo link.

The die structure for the punch member 33 0..,in` the eld E comprises the forming arbors 46 and'41 in alignment respectively with the forming lchannel 31, and the forming channels 44 Hy a'nd45 in theA punchl member 33. These arbors are mounted inv a supporting block 48 which is movable vertically on posts 58 secured to and `eXtending'upwardlg'r from the die block I4. The arborblock'is yieldably held in its normal position by the pressure of resistance means such as a spring ,`or as shown, a rubber member 5I. This Arubber member is shown in the form of a cylin- -dricalblock bored to receive abar 52l secured to arnjlldepending fromthe die -block and terminating in a head 53,-an abutmentrwasher 54 being inserted between the Ihead andthe lowerend of the rubber block. y An abutment washer-55 is inserted between .the yupper end. of thev rubber block and acollar 56 vslidableon .the bar.u52. Rods 51 extend *between .the bottom of. the arbor block and the collar 56` throughguide passageways 58 in the die block'. The rubberA block nor,- mally holds 'the collar 56 up against' the under side of the die block for setting of therods 51 for holding the arbor block in'its normal position. Downward movementrof the arbor blocki's communicated through the rods and the collaruto the rubber block which resists such downward move'- ment, a clearance passageway 59 being provided in'the punchV press bed I6 for the Aresistance structure assembly below the die block. Refer'- 'ring to Figure '1, ythe forming arbor 46 is adjustably secured at its rear end in the block 48 by set screws 60 and 6I', and, as shown in Figure 8, the Aarbor 41 is adjustably securedin the Ablock by set screws 62 and 63. r y

Below the arbors, and in vertical alignment with the punch member 33, the 'die member 64l is mounted on the die block I4. Thisdie member 'has the semi-circular forming channel'or recess 65 in lvertical alignment with the' arbor 46 and the forming recess-31 in the punch member 33. Thev cooperation vof vthese "forming surfaces with the arbor 46 will bend the embryo link tongue I3 into its iinal circular form. .The die-member 64 has-the semi-circular form- -ing'surfaces 66and 61 in' vertical alignment with the arbor 41 and the forming recesses44 and 45 in the punch member 33, these forming recesses cooperating with the arbor 41 to bend the-'embryo linkY tonguesv I I and-I2 into circular form.

Aq() Movable vertically in the die member 64 between the formingsurfaces 66 and 61 is va spacer member 68 for engaging between the tongues II and -I2 Ato keep .these tongues properly spaced apart while they are being bent into circular form. 5 A spring 69 below the spacer member tends.v to

hold it upwardly in normal position with itsupper end a 'distance abovethe formingfsurfac'es 66 and 61 so as to engage between the tongues I I and I2 to space them andalso to guidethem to J0 the surfaces 66 and `61,.the,spacer memberin'its upper and having the arcuateV surface 1 0 `for engaging the arbor 41 during nal forming` ofthe loops, as shown in Figures-6 and 8. A. l l

Figures 1 and 2 show the'punch me'mbe'rfinf its jacent come channel 4c being ip'aiignm'ent withl 75l upper position for feeceof. the stocnbandto bring the embryo link from the field Dlinto the forming field E. On Figure 5 Ythe dotted lines show the punch member 33 in its upper position, with the embryo link extended across the arbors with yits depressed part 30 extending down between-the arbors and with the loop forming tongues eX- tending laterally. The embryo link is still secured to the band by the tie lines 2|, but, as the punch member 33 is moved downwardly, the link is severed from the stock band before it is engaged by the punch member. This-.severing of the link from the band'is accomplished by a cutter II -mounted on the` forward side of the punch member 33 for cooperation Ywith the die I2 on the die block I4. ering of the embryo link from the -stock band, the punch member 33 engages the Alink and-bends the tongues thereof downward `'and partially `around the arbors 46 and' 4'I'to extend downwardly, yas shown by thefull lines of Figure 5. This downward pressure of the punch member .334 against the arbors to partially bend thev link tongues is against the resistance of theresistance member 5| which acts against the `arbor bearing block through therods 51.` As the arbor block with the partially formed link thereon continues its downward movementthe'bent end of the tongue yI 3 is brou-ght into engagement with the forming surface "65 onA the diemember GII, and the bent ends of the tongues II" and I2 are broughtinto'engagement with the forming surfaces 66 and 61, the spacer member 68 having been previously received between the' tongues lII and I2 to hold them properlyfspaced for engagement with the surfaces 66 and 6l. When the punch member 33 reaches -its final `downward position, as shown by the full lines lon Figure 6, thetongues will Vhave been deflected around the arbors46 and 41 to full circular form to complete the link, as shown on Figure 6.

As the tongue I3 is deflected around the middle portion of the arbor 46, the olTset ends IIJ of the link body I are received in the recesses38 and `39 in the punch member 33 (Figure 7), and

are applied by the punch `member respectively against the enlargement I3 ofthe arbor 46"and a plate 'I4 on the die member 64 atl the end of the arbor 46, Figures 2, Lland 7. The enlargement 'I3 and the platev 'I4 serve also to hold the tongue I3 properly aligned transversely whilefit 1 is being bent longitudinallyaround the' arbor 46. In `order to balance the arbor supporting structure for freemoveme'nt thereof during the final formation of the link, abutment studs'15are pro'- vided on the punch blockl 5 for engagement with the arbor block '48 afterlthe' ypunch member33 has' come into engagement with the arbors for preliminary bending `of the link tongues against the resistance of the'member 5I, thepa'rtially completed link `being then'lheldclamped bythe A the arbor block to itsnormal position, shown :in

Figure l, and theflnishedlinkis-nowfreadyfor ejection from the arbors. L I' 1 1 Referring to `Figures 1l a d 12, thefembryo link in the field D is shown withthe deflection 38 therein. However, referring to'Figures `l and Immediately `after'sev- 2,thepunch member 3| in the field D does not -eld D is engaged by the punch member 3I=and before .thel cutting operation, the ends of the ,linktongues II and I2 will project into there.-

cesses 34 and 35'in the punch member v33 ofthe field E, and the end of the tongue II of the link inthe eld D will partially overlie the arbor 46, the end-of the linktongue I2 being clear of the arbor bybeing outside of the front end of the arbor. `In order that the tongue II of the link in field D'lwill not be distorted by engagement -therewith `of the punch member 33 when :the punch block- I 5'movesdownwardlyfor the cutting operation, Vthe Varbor 46 is `provided with the clearance recess X as shown on Figure 4, and in dotted lines on Figure 5`- As the punch block now continues its downward movement for sev.-

Vering `of the'link in the'eld E and ,for engagement' of the punch member33 with the link, the tongues II and I2 of the link in field D will be received vinthe recesses 34 and-35 in the punch member and theny when the punch member-3| in eld'D co-ioperates with the die member 32,

after the cutting operation in field E, the formation of the deflection 38 in the link in eld D will draw the link tongues I Iand I2 in a direction away'irom the; field E so that the tongue ends which'eXtend into the recesses 34 and 35 of the punch member 33` will not interfere `with `the final movements of the punchmember into cooperation with theidie member 64 for the nal bending into circular'form of the link in the fleldE..`4 1 The ejector mechanismis best shown on Figures 7 to l0. It comprisesthe ejector rod 'I6 shiftable in the arbor block 4l!V between the arbors for engagement atitsouter end with theV body of the finishedlink. At its inner end the ejector rod is secured to.a head 'I'.'I slidable in the ex.- te'n'sion 'I3 on lthe arbor blocks. A pinlf'IB ex tends from the head II' through a 4slotliil in the 'eXtensionTIB and is connected by a, spring 8| with `thepin 82 on the arbor block, the spring tending to shift the head and the ejector rod out1- wardly. The operation of the rodis controlled by cam means. Secured to and dependingffrom thepunch block I5 is a bar 83. This bar extends alongside of the'extension18 on the arbor block 48 and has a triangular recess 84 extending. there in from its outer edge, and within this recess a triangular cam'member 85 is fulcrumed onra .pin 86.' A cylindrical stud.81 extends lfrom the ejector rod head I'I for cooperation with the cam member 85 for control of the ejection of Alinksat the` proper time. At its lower end the cammember 85 has a pin 88` connected by a spring'89 with a pin 3U on the bar 83, the spring tending to hold the cam member with its lowerendwithin the cam recess84. The bar 83 has the slot 8| in itszouter edge through which the pin 88 may travel for `rocking of the-cam member 85 on its fulcrum 86. I

In the open position of the die structure,` Figure 1, the stud 81 of the ejector is in front of the lower end of the cam member B5, the ejector being in its inner position. As the punch block I5 moves downwardly with the bar 83, the outer edge of the cam` member moves past the stud8'l until the upper end of the cam member passes the stud, and by this `time the punch member 33 and the studs "I5 on the punch block will have come into engagement respectively,` with :the

arbors and the arbor block 48 so 'that during further downward movement of the punch block,

the bar A83 and the arbor block will vmove downwardly together until the link isiinally4 formed.

.Figures 7 and 9 show the position of the ejector member l until the arbor block has been returned to its normal position, asshown on Figure l'. 'As the punch block and the cam bar 83 ico'ntinue their upward movement, the ejector head stud 81 is shifted by the spring 8| into the camway between the cam surface 92 of the cam recess 84 and the upper surface 93 of the cam member 85, as shown on Figure 10, the ejector bar being thus shifted outwardly for ejection of the'nished link from the arbor. During .the final upward movement of the punch blockV and cam bar'83, the lower cam surface 94 of the cam recess 84`will cam the ejector stud 81 outwardly in the recess 84, such outward travel ofthe stud rocking the cam member 85 against its spring 98j until the ejector stud leaves the cam recess -84whereupon the spring 89 returns the 'cam member 85 to its normal position and thestud 81 will then again be in front of the lower end of the cam member when the punch block reaches its upper position, and the ejector bar will again bein'its inner position shown on Figure 9.

We thus produce a very efficient unitary diev structure which can be economically manufactured and which can be readily mounted in the ordinary punch press forv operation thereby Without' the need of a multiplicity of cams, springs, or other accessories. In our improved structure and procedure, simple die and punch `sets effect the preliminary bending and forming of the links so lthat in the final forming field the die member and the punch member may cooperate with the resistance Supported arbors to complete the bending of the link tongues into the circular loops during one downward movement of the punch block.

We' have shown a practical and efcient embodiment of the various features of our invention, but we do not desire to be limited to the exact construction, arrangement and operation shown and described, as ehanges'and modifications may be made without departing from the scope. of the' invention.

We claim as our invention:

119A' unitary die structure for progressively forming links of the type having a body part with a pair'of cartridge receiving loops at one side thereoie and a hinge loop at the other side thereof, comprising a' stationary die member, a movable punch member, forming'arbors, resistance means yieldably holding said'arbors in'normal position between said die member punch member for receiving an embryo link,` said punch member upon movement cooperating'with said arbors' topartially form the link loops against the pressure of said resistance means and to then'carry said arbors into engagement with said stationaryfdie member for final forming ofthe link lops, a spacer element, and means resiliently mounting said spacer element on'said stationary die member for engaging between said cartridge receiving loops tohold them spaced aparta required distance and movable with said arbors during the final formation thereof around said arbors.

2. A unitary die 'structure for progressively forming links of the type described having a body partwith a pair of cartridge receiving loops at one side and a hinge loop at the other vside thereof, comprising a stationary die member, a movable punch member, forming arbors, resistance means yieldably holding said` arborsin normal position between said die member and punch member for receiving an embryo link, said punch member adapted upon movement thereof to cooperate with said arbors to partially form the loops against' the pressure of Ysaid resistance means'and to 'then carry said arbors into engagement with said stationary die member for final forming of the link loops, a spring urged spacer member in said stationary die adapted upon 'downward movement' of said arbors to engage between the partially formed cartridge receiving loops and to receive the arbor therefor before 'said partially formed loops engage with said stationary die member whereby said spacer member will guide said cartridge receiving loops during final formation thereof by'said stationary die so that the cartridge receiving loops after nal formation will be the required distance axially apart. 3. A unitary die structure for progressively forming links of the type described having a body part with a pair of loop tongues of circular form extending from one side and a hingeloop tongue of circular form extending from the otherl side, comprising a'die block, a punch block, a number of die members onisaid die block and cooperating punch members on said punch block effective during successive movements of said punch block into engagement with said die block to cut the link blanks out of a sheet metal stock band in substantially flat` form with the exception of tie lines between 'the hinge loop tongues of one blank and the cartridge receiving loop tongues of adjacent blanks and then to give the outer ends of all the tongues a preliminary downward bend and the link body and the adjacent inner ends of the tongues of each blank a preliminary downward bend to form the beginning of the link loops, a pair of arbors for receiving the embryo links, a resistant support on said die block for said arbors, a forming die member on said die block below said arbors and a forming punch member on the punch block above said arbors, a cutter on said punch block for cutting an embryo link along its tie lines for severance thereof from the stock band, said cutting occurring just before said form punch member engages the severed link and just before the embryo link has its body and inner *ends of its tongues deflected downwardly, further l downward movement of said forming `punch member causing cooperation thereof with said arbors-against the resistance of said support for partially bending the tongues of the received severed link blank around said arbors toward circular form, continued movement of said forming punch member'moving the arbors with the partially formed link thereon downwardly into cooperation with said forming die member for final forming of the link tongues into circular loops, and a spring urged spacer member in'said forming die member eiective to receive the arbor which has the partially formed cartridge receiving loop tongues thereon before the loop tongues of the link engage with the forming die member whereby'said catrtridge forming loop tongues will be guided during nal bending thereof into circular form to the required distance axially apart in the nished link.

4. A unitary die structure for progressively forming links of the type described, comprising a stationary die member, a movable punch member, forming arbors, a supporting block for said arbors, resistance means yeldably holding said supporting block with the arbors thereon in normal position between said die member and punch member for receiving an embryo link, said punch member upon movement thereof cooperating with said arbors to partially form the link loops against the resistance of said supporting block and to then carry said block with the arbors into engagement with said stationary die member for final forming of the link loops, an ejector member movable on said supporting block between the arbors thereon, a stud on said ejector member, a bar depending from said punch member and having a cam way therein, said ejector member being normally in an outer position, and means eiective during movement of said punch member away from said die member after forming of the link for guiding said stud into said cam way for movement of said ejector member to eject the nished link from said arbors.

5. A unitary die structure for progressively forming links of the type described, comprising a stationary die member, a movable punch member, forming arbors, a supporting block for said arbors, resistance means yieldably holding said supporting block with the arbors thereon in normal position between said die member and punch member for receiving an embryo link, said punch member upon movement thereof cooperating with said arbors to partially form the link loops against the resistance of said supporting block and to then carry said block with the arbors into engagement with said stationary die member for nal forming of the link loops, an ejector member movable on said supporting block between the arbors thereon, a stud on said ejector member, a bar depending from said punch member and having a cam way therein, said ejector member being normally in an outer position, and means effective upon movement of said punch member away from said die member after forming of a link for causing said stud to move rst inwardly along said cam way for movement of the ejector member to eject the nished link from the arbors and then outwardly in said cam way for restoring the ejector to normal position.

KARL H. FERNLUND. JOHN O. HESSLER. ALLAN E. HULTBERG. 

